E45 - Transmission error between inverter and outdoor unit PCB or loose connection at CnI

What does E45 mean?

This error indicates a transmission error in communication between the inverter and the outdoor unit's PCB, or a loose connection at the CnI terminal.

• Loose or damaged communication wiring between the inverter and outdoor PCB.
• Faulty outdoor unit PCB.
• Faulty inverter board.
• Loose connection at the CnI terminal.

Click steps to track your progress.

1. 1

   Turn off the main power supply to the outdoor unit at the circuit breaker.

2. 2

   Have a qualified technician inspect the communication wiring between the inverter and the outdoor unit's PCB.

3. 3

   The technician should check the CnI terminal for a secure connection.

4. 4

   If the wiring and connections are good, the inverter or outdoor PCB may be faulty and require professional replacement.